Please read the description/textbox first. This circuit is part of a kind of series. The first video of this very easy to make transistor flasher with a Green or Red LED was published earlier and tested and worked for half a year with 2 alkaline batteries of 1.5 Volt each, so 3 Volt in series.
I published that circuit on You Tube on 11 July 2022 https://youtu.be/1pABd9En0Nc
But the first video was earlier, here https://youtu.be/xydI5tOjni0
That was 8 March 2022
The circuits of 8 March 2022 and 11 July 2022 only worked/work with normal RED or GREEN or YELLOW or ORANGE LEDS. Reason: the 3 Volt power supply (2 alkaline or carbon-zinc batteries in series).
LEDS with specific colors (due to their physical properties, barrier voltage, valence bands) can produce light of a certain spectrum in the (for humans) visible range. That "looks" like red, green, orange, to our eyes.
LED light is produced when an electron falls down into another valance band around the atom, sending out light photon(s) of a specific frequency, thus a frequency that can lay in the visible light spectrum. Or not in the visible spectrum….
In general it means that to produce white light, more energy has to be put into the semiconductor structure to get a substantial amount of light out.
And we know that white light has a broad (or broader....not specified) frequency spectrum compared to light on (other) specific frequencies: Green, RED, etc. These frequencies of light are fixed.
With say reference to the prism, where white light (from the sun, by the way, a boadband light source) can be spliced into different frequency bands.
When you study the light emittance of (say) a noble gas lamp or a neon tube you will surely find a completely different spectrum. Can be done with a spectrophotometer. Or with a Compact Player disk, hold it under a certain angle to the light source, then you see refleted the different colors=frequencies.
Anyway: the importance of this is that a white LED needs a higher supply voltage to produce white light, not talked about where the specific frequencies in the light band (produced by that “white” LED) are. Can only be found with a spectrophotometer.
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I keep all my YT videos constant actual, so the original video’s with the most recent information are always on YouTube. Search there, and avoid my circuits that are republished, re-arranged, re-edited on other websites, giving not probable re-wiring, etc. Some persons try to find gold via my circuits. I take distance from all these fake claims. I cannot help that these things happen. Upload 15 July 2022.
Correction to this video: with higher voltages in an oscillator circuit (like this) the frequency will in general go higher. But there is also an effect where the capacitor gets a higher charge in a shorter time, making that the frequency can go down. It is all physics theory (R-C circuits, related to the voltage supply of an R-C circuit, higher/lower voltages).